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Formación de nuevas poblaciones estelares a partir del gas acumulado por cúmulos estelares jóvenes masivos
Chengyuan Li1,2,3, Richard de Grijs1,4, Licai Deng2
1Kavli Institute for Astronomy and Astrophysics and Department of Astronomy, Peking University, Yi He Yuan Lu 5, Hai Dian District, Beijing 100871, China.
Nature
|January 29, 2016
Resumen
Los cúmulos estelares masivos pueden formar nuevas estrellas a través de la acreción de gas, explicando múltiples poblaciones estelares. Esto desafía la teoría de la formación de una sola ráfaga para los antiguos cúmulos globulares.
Área de la Ciencia:
- Astronomía y astrofísica
- Evolución estelar
- Formación de galaxias
Sus antecedentes:
- Los cúmulos estelares masivos generalmente forman estrellas en un solo evento.
- Los viejos y masivos cúmulos globulares exhiben múltiples poblaciones estelares, lo que sugiere múltiples episodios de formación estelar.
- Los vientos estelares colisionantes de estrellas gigantes asintóticas son un desencadenante propuesto para la formación de estrellas de segunda generación en cúmulos masivos.
Objetivo del estudio:
- Investigar los mecanismos de formación de poblaciones estelares múltiples en cúmulos estelares masivos.
- Para probar la hipótesis de que la acreción de gas puede alimentar la posterior formación de estrellas dentro de los cúmulos.
- Para explorar el papel del entorno galáctico en la formación de la evolución de los cúmulos.
Principales métodos:
- Observación de tres cúmulos estelares masivos y jóvenes (1-2 mil millones de años) en las Nubes de Magallanes.
- Análisis de poblaciones estelares para identificar épocas distintas de formación estelar.
- Modelado de la acreción de gas dentro de los discos gaseosos galácticos.
Principales resultados:
- Evidencia de la formación de estrellas tipo explosión que ocurre varios cientos de millones de años después de la formación inicial del cúmulo.
- Demostración de que la acreción de gas es un mecanismo viable para alimentar esta formación estelar posterior.
- Identificación de una vía potencial para explicar las poblaciones estelares múltiples en los cúmulos globulares.
Conclusiones:
- La acreción de gas dentro de los discos galácticos puede permitir múltiples eventos de formación estelar en cúmulos estelares masivos.
- Este proceso de acreción proporciona una explicación plausible para las poblaciones estelares múltiples observadas en los cúmulos globulares antiguos.
- Los hallazgos desafían el modelo de formación de ráfaga única y resaltan la importancia de los factores ambientales en la evolución del cúmulo.
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